Ext.ns('Ext.ux');

Ext.ux.Lightbox = (function(){
		var els = {},
			images = [],
			activeImage,
			initialized = false,
			selectors = []; 

	return {
		overlayOpacity: 0.85
	,	animate: true
	,	resizeSpeed: 8
	,	borderSize: 10
	,	labelImage: "Image"
	,	labelOf: "of"

	,	init: function() {
			this.resizeDuration = this.animate ? ((11 - this.resizeSpeed) * 0.15) : 0;
			this.overlayDuration = this.animate ? 0.2 : 0;

			if(!initialized) {
				Ext.apply(this, Ext.util.Observable.prototype);
				Ext.util.Observable.constructor.call(this);
				this.addEvents('open', 'close');
				this.initMarkup();
				this.initEvents();
				initialized = true;
			}
		}

	,	initMarkup: function() {
			els.shim = Ext.DomHelper.append(document.body, {
					tag: 'iframe'
				,	id: 'ux-lightbox-shim'
			}, true);
			els.overlay = Ext.DomHelper.append(document.body, {
				id: 'ux-lightbox-overlay'
			}, true);

			var lightboxTpl = new Ext.Template(this.getTemplate());
			els.lightbox = lightboxTpl.append(document.body, {}, true);

			var ids =
			 ['outerImageContainer', 'imageContainer', 'image', 'hoverNav', 'navPrev', 'navNext', 'loading', 'loadingLink',
			 'outerDataContainer', 'dataContainer', 'data', 'details', 'caption', 'imageNumber', 'bottomNav', 'navClose'];

			Ext.each(ids, function(id){
				els[id] = Ext.get('ux-lightbox-' + id);
			});

			Ext.each([els.overlay, els.lightbox, els.shim], function(el){
				el.setVisibilityMode(Ext.Element.DISPLAY)
				el.hide();
			});

			var size = (this.animate ? 250 : 1) + 'px';
			els.outerImageContainer.setStyle({
				width: size,
				height: size
			});
		}
	
	,	getTemplate : function() {
			return [
				 '<div id="ux-lightbox">',
				 '<div id="ux-lightbox-outerImageContainer">',
				 '<div id="ux-lightbox-imageContainer">',
				 '<img id="ux-lightbox-image">',
				 '<div id="ux-lightbox-hoverNav">',
				 '<a href="#" id="ux-lightbox-navPrev"></a>',
				 '<a href="#" id="ux-lightbox-navNext"></a>',
				 '</div>',
				 '<div id="ux-lightbox-loading">',
				 '<a id="ux-lightbox-loadingLink"></a>',
				 '</div>',
				 '</div>',
				 '</div>',
				 '<div id="ux-lightbox-outerDataContainer">',
				 '<div id="ux-lightbox-dataContainer">',
				 '<div id="ux-lightbox-data">',
				 '<div id="ux-lightbox-details">',
				 '<span id="ux-lightbox-caption"></span>',
				 '<span id="ux-lightbox-imageNumber"></span>',
				 '</div>',
				 '<div id="ux-lightbox-bottomNav">',
				 '<a href="#" id="ux-lightbox-navClose"></a>',
				 '</div>',
				 '</div>',
				 '</div>',
				 '</div>',
				 '</div>'
			];
		}

	, 	initEvents: function() {
			var close = function(ev) {
				 ev.preventDefault();
				 this.close();
			};

			els.overlay.on('click', close, this);
			els.loadingLink.on('click', close, this);
			els.navClose.on('click', close, this);

			els.lightbox.on('click', function(ev) {
				if(ev.getTarget().id == 'ux-lightbox') {
					this.close();
				}
			}, this);

			els.navPrev.on('click', function(ev) {
				ev.preventDefault();
				this.setImage(activeImage - 1);
			}, this);

			els.navNext.on('click', function(ev) {
				ev.preventDefault();
				this.setImage(activeImage + 1);
			}, this);
		}
//not
	,	register: function(sel, group) {
			if(selectors.indexOf(sel) === -1) {
				selectors.push(sel);

				Ext.fly(document).on('click', function(ev){
					var target = ev.getTarget(sel);

					if (target) {
						 ev.preventDefault();
						 this.open(target, sel, group);
					}
				}, this);
			}
		}

	, 	open: function(image, sel, group) {
			group = group || false;
			this.setViewSize();
			els.overlay.fadeIn({
				duration: this.overlayDuration,
				endOpacity: this.overlayOpacity,
				callback: function() {
					images = [];

					var index = 0;
					if(!group) {
						images.push([image.href, image.title]);
					}
					else {
						var setItems = Ext.query(sel);
						Ext.each(setItems, function(item) {
							if(item.href) {
								images.push([item.href, item.title]);
							}
						});

						while (images[index][0] != image.href) {
							index++;
						}
					}

					// calculate top and left offset for the lightbox
					var pageScroll = Ext.fly(document).getScroll();

					var lightboxTop = pageScroll.top + (Ext.lib.Dom.getViewportHeight() / 10);
					var lightboxLeft = pageScroll.left;
					els.lightbox.setStyle({
						 top: lightboxTop + 'px',
						 left: lightboxLeft + 'px'
					}).show();

					this.setImage(index);

					this.fireEvent('open', images[index]);
				},
				scope: this
			});
		}

	, 	setViewSize: function(){
			var viewSize = this.getViewSize();
			els.overlay.setStyle({
				width: viewSize[0] + 'px',
				height: viewSize[1] + 'px'
			});
			els.shim.setStyle({
				width: viewSize[0] + 'px',
				height: viewSize[1] + 'px'
			}).show();
		}

	, 	setImage: function(index){
			activeImage = index;

			this.disableKeyNav();
			if (this.animate) {
				els.loading.show();
			}

			els.image.hide();
			els.hoverNav.hide();
			els.navPrev.hide();
			els.navNext.hide();
			els.dataContainer.setOpacity(0.0001);
			els.imageNumber.hide();

			var preload = new Image();
			preload.onload = (function(){
				 els.image.dom.src = images[activeImage][0];
				 this.resizeImage(preload.width, preload.height);
			}).createDelegate(this);
			preload.src = images[activeImage][0];
		}

	, 	resizeImage: function(w, h){
			var wCur = els.outerImageContainer.getWidth();
			var hCur = els.outerImageContainer.getHeight();

			var wNew = (w + this.borderSize * 2);
			var hNew = (h + this.borderSize * 2);

			var wDiff = wCur - wNew;
			var hDiff = hCur - hNew;

			var afterResize = function(){
				els.hoverNav.setWidth(els.imageContainer.getWidth() + 'px');

				els.navPrev.setHeight(h + 'px');
				els.navNext.setHeight(h + 'px');

				els.outerDataContainer.setWidth(wNew + 'px');

				this.showImage();
			};

			if (hDiff != 0 || wDiff != 0) {
				els.outerImageContainer.shift({
					height: hNew,
					width: wNew,
					duration: this.resizeDuration,
					scope: this,
					callback: afterResize,
					delay: 50
				});
			}else{
			 afterResize.call(this);
			}
		}

	,	showImage: function(){
			els.loading.hide();
			els.image.fadeIn({
				duration: this.resizeDuration,
				scope: this,
				callback: function(){
					this.updateDetails();
				}
			});
			this.preloadImages();
		}

	, 	updateDetails: function(){
			var detailsWidth = els.data.getWidth(true) - els.navClose.getWidth() - 10;
			els.details.setWidth((detailsWidth > 0 ? detailsWidth : 0) + 'px');

			els.caption.update(images[activeImage][1]);

			els.caption.show();
			if (images.length > 1) {
				els.imageNumber.update(this.labelImage + ' ' + (activeImage + 1) + ' ' + this.labelOf + ' ' + images.length);
				els.imageNumber.show();
			}
			
			els.dataContainer.fadeIn({
				duration: this.resizeDuration/2,
				scope: this,
				callback: function() {
					var viewSize = this.getViewSize();
					els.overlay.setHeight(viewSize[1] + 'px');
					this.updateNav();
				}
			});
		}

	, 	updateNav: function(){
			this.enableKeyNav();

			els.hoverNav.show();

			// if not first image in set, display prev image button
			if (activeImage > 0)
				els.navPrev.show();

			// if not last image in set, display next image button
			if (activeImage < (images.length - 1))
				els.navNext.show();
		}

	, 	enableKeyNav: function() {
			Ext.fly(document).on('keydown', this.keyNavAction, this);
		}

	, 	disableKeyNav: function() {
			Ext.fly(document).un('keydown', this.keyNavAction, this);
		}

	, 	keyNavAction: function(ev) {
			var keyCode = ev.getKey();

			if ( keyCode == 88 || // x
				 keyCode == 67 || // c
				 keyCode == 27 ){
					this.close();
			}else if (keyCode == 80 || keyCode == 37){ // display previous image
				if (activeImage != 0){
					this.setImage(activeImage - 1);
				}
			}else if (keyCode == 78 || keyCode == 39){ // display next image
				if (activeImage != (images.length - 1)){
					this.setImage(activeImage + 1);
				}
			}
		}

	, 	preloadImages: function(){
			var next, prev;
			if (images.length > activeImage + 1) {
				 next = new Image();
				 next.src = images[activeImage + 1][0];
			}
			if (activeImage > 0) {
				 prev = new Image();
				 prev.src = images[activeImage - 1][0];
			}
		}

	,	close: function(){
			this.disableKeyNav();
			els.lightbox.hide();
			els.overlay.fadeOut({
				duration: this.overlayDuration
			});
			els.shim.hide();
			this.fireEvent('close', activeImage);
		}

	, 	getViewSize: function() {
			return [Ext.lib.Dom.getViewWidth(), Ext.lib.Dom.getViewHeight()];
		}
	}
})();

Ext.onReady(Ext.ux.Lightbox.init, Ext.ux.Lightbox);